Pith Number

pith:W7R4IR5V

pith:2009:W7R4IR5VRI3M3SDZPK6D3VZFWG

not attested not anchored not stored refs pending

Knots in the Helix Nebula found in H2

A.A. Zijlstra (Manchester), A.K. Speck (Missouri), B.M. McHunu (Missouri), I. Tanaka (NAOJ), M.D. Smith (Kent), M. Matsuura (NAOJ, N.J. Wright (UCL), R. Wesson (UCL), S. Viti (UCL), UCL)

arxiv:0906.2870 v1 · 2009-06-16 · astro-ph.SR

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{W7R4IR5VRI3M3SDZPK6D3VZFWG}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-05-18T02:13:19.810253Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b7e3c447b58a36cdc8797abc3dd725b18b35cd6822a83c743d78490f531ef0f2

Aliases

arxiv: 0906.2870 · arxiv_version: 0906.2870v1 · doi: 10.48550/arxiv.0906.2870 · pith_short_12: W7R4IR5VRI3M · pith_short_16: W7R4IR5VRI3M3SDZ · pith_short_8: W7R4IR5V

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/W7R4IR5VRI3M3SDZPK6D3VZFWG \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: b7e3c447b58a36cdc8797abc3dd725b18b35cd6822a83c743d78490f531ef0f2

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "8cd90f835b32fdbd7c00cd57f13879fef441aa6dbdd324f97185c188726429d8",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2009-06-16T13:00:44Z",
    "title_canon_sha256": "cf7ba95574af105b823cd056092bc85ff35cd667fef8a9259d8da36673b7d6c9"
  },
  "schema_version": "1.0",
  "source": {
    "id": "0906.2870",
    "kind": "arxiv",
    "version": 1
  }
}